Recording apparatus

Abstract

A recording apparatus includes: a first rotating member, a second rotating member that is adjacent to and downstream of the first rotating member, a third rotating member positioned downstream of the second rotating member, a recording portion, and a floating detection portion. As viewed along a rotation axis line direction of the first rotating member, letting a first arc portion be an abutment portion between the recording medium and the first rotating member, and letting a third arc portion be an abutment portion between the recording medium and the third rotating member, a third arc height, which is a distance from a chord of the third arc portion to an apex of the third arc portion, is smaller than a first arc height, which is a distance from a chord of the first arc portion to an apex of the first arc portion.

What is claimed is: 
     
         1 . A recording apparatus comprising:
 a first rotating member for supporting a recording medium while rotating, and conveying the recording medium along an outer peripheral surface of the first rotating member such that a recording side of the recording medium bulges;   a second rotating member that is adjacent to and downstream of the first rotating member in a conveying direction of the recording medium, the second rotating member being for supporting the recording medium while rotating;   a third rotating member downstream of the second rotating member in the conveying direction, the third rotating member being for supporting the recording medium while rotating, and conveying the recording medium along an outer peripheral surface of the third rotating member such that the recording side of the recording medium bulges;   a recording portion for performing a recording operation on the recording side of the recording medium, at a location downstream of the third rotating member in the conveying direction; and   a floating detection portion for detecting floating of the recording medium between the first rotating member and the second rotating member,   wherein, as viewed along a rotation axis line direction of the first rotating member, letting a first arc portion be an abutment portion between the recording medium and the first rotating member, and letting a third arc portion be an abutment portion between the recording medium and the third rotating member, a third arc height, which is a distance from a chord of the third arc portion to an apex of the third arc portion, is smaller than a first arc height, which is a distance from a chord of the first arc portion to an apex of the first arc portion.   
     
     
         2 . The recording apparatus according to  claim 1 , wherein
 the second rotating member conveys the recording medium along an outer peripheral surface of the second rotating member such that the recording side of the recording medium bulges, and   as viewed along the rotation axis line direction, letting a second arc portion be an abutment portion between the recording medium and the second rotating member, a second arc height, which is a distance from a chord of the second arc portion to an apex of the second arc portion, is smaller than or equal to the first arc height.   
     
     
         3 . The recording apparatus according to  claim 1 , wherein
 the recording medium is a label roll constituted by a base material layer that has the recording side, a release layer, and an adhesive layer for adhering the base material layer and the release layer to each other, and   letting Y be a thickness of the release layer of the recording medium, letting Rt be a radius of the first rotating member, letting θt be a central angle of the first arc portion, letting Ru be a radius of the third rotating member, and letting θu be a central angle of the third arc portion,   the first rotating member and the third rotating member satisfy:   
       
         
           
             
               
                 
                   
                     
                       
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                     Expression 
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         4 . The recording apparatus according to  claim 1 , wherein
 a central angle of the third arc portion is smaller than a central angle of the first arc portion.   
     
     
         5 . The recording apparatus according to  claim 2 , further comprising:
 a fourth rotating member downstream of the third rotating member in the conveying direction, the fourth rotating member being for supporting the recording medium while rotating, and conveying the recording medium along an outer peripheral surface of the fourth rotating member such that the recording side of the recording medium bulges; and   a fifth rotating member that is adjacent to and downstream of the fourth rotating member in the conveying direction, the fifth rotating member being for supporting the recording medium while rotating,   wherein the recording portion includes a discharging head for discharging a liquid toward the recording side of the recording medium, at a location between the fourth rotating member and the fifth rotating member in the conveying direction, and   as viewed along the rotation axis line direction, letting a fourth arc portion be an abutment portion between the recording medium and the fourth rotating member, the first arc height is equivalent to a fourth arc height, which is a distance from a chord of the fourth arc portion to an apex of the fourth arc portion.   
     
     
         6 . The recording apparatus according to  claim 5 , wherein
 a distance between the first rotating member and the second rotating member is equivalent to a distance between the fourth rotating member and the fifth rotating member, a radius of the first rotating member is equivalent to a radius of the fourth rotating member, a radius of the second rotating member is equivalent to a radius of the fifth rotating member, and a central angle of the first arc portion is equivalent to a central angle of the fourth arc portion,   the second rotating member conveys the recording medium along the outer peripheral surface thereof such that the recording side of the recording medium bulges,   the fifth rotating member conveys the recording medium along an outer peripheral surface thereof such that the recording side of the recording medium bulges, and   as viewed along the rotation axis line direction, letting a fifth arc portion be an abutment portion between the recording medium and the fifth rotating member, a central angle of the second arc portion is equivalent to a central angle of the fifth arc portion.   
     
     
         7 . The recording apparatus according to  claim 1 , further comprising:
 a sixth rotating member downstream of the third rotating member and upstream of the recording portion in the conveying direction, the sixth rotating member being for supporting the recording medium while rotating, and conveying the recording medium along an outer peripheral surface of the sixth rotating member such that a side of the recording medium opposite to the recording side thereof bulges.   
     
     
         8 . The recording apparatus according to  claim 7 , wherein
 as viewed along the rotation axis line direction, letting a sixth arc portion be an abutment portion between the recording medium and the sixth rotating member, a central angle of the sixth arc portion is larger than a central angle of the first arc portion and a central angle of the third arc portion.   
     
     
         9 . The recording apparatus according to  claim 1 , wherein
 the floating detection portion detects an amount of floating of the recording medium from a conveyance path that extends between the first rotating member and the second rotating member.   
     
     
         10 . The recording apparatus according to  claim 1 , further comprising:
 a plurality of rotating members that respectively oppose the first rotating member, the second rotating member, and the third rotating member, so as to sandwich and convey the recording medium.   
     
     
         11 . A recording apparatus comprising:
 a first rotating member for supporting a recording medium while rotating, and conveying the recording medium along an outer peripheral surface of the first rotating member such that a recording side of the recording medium bulges;   a second rotating member that is adjacent to and downstream of the first rotating member in a conveying direction of the recording medium, the second rotating member being for supporting the recording medium while rotating;   a third rotating member downstream of the second rotating member in the conveying direction, the third rotating member being for supporting the recording medium while rotating, and conveying the recording medium along an outer peripheral surface of the third rotating member such that the recording side of the recording medium bulges;   a recording portion for performing a recording operation on the recording side of the recording medium, at a location downstream of the third rotating member in the conveying direction; and   a floating detection portion for detecting floating of the recording medium between the first rotating member and the second rotating member,   wherein, as viewed along a rotation axis line direction of the first rotating member, letting a first arc portion be an abutment portion between the recording medium and the first rotating member, and letting a third arc portion be an abutment portion between the recording medium and the third rotating member, a central angle of the third arc portion is smaller than a central angle of the first arc portion.   
     
     
         12 . The recording apparatus according to  claim 11 , wherein
 the second rotating member conveys the recording medium along an outer peripheral surface of the second rotating member such that the recording side of the recording medium bulges, and   as viewed along the rotation axis line direction, letting a second arc portion be an abutment portion between the recording medium and the second rotating member, a central angle of the second arc portion is smaller than or equal to the central angle of the first arc portion.   
     
     
         13 . The recording apparatus according to  claim 11 , further comprising:
 a fourth rotating member downstream of the third rotating member in the conveying direction, the fourth rotating member being for supporting the recording medium while rotating, and conveying the recording medium along an outer peripheral surface of the fourth rotating member such that the recording side of the recording medium bulges; and   a fifth rotating member that is adjacent to and downstream of the fourth rotating member in the conveying direction, the fifth rotating member being for supporting the recording medium while rotating,   wherein the recording portion includes a discharging head for discharging a liquid toward the recording side of the recording medium between the fourth rotating member and the fifth rotating member in the conveying direction, and   as viewed along the rotation axis line direction, letting a fourth arc portion be an abutment portion between the recording medium and the fourth rotating member, the central angle of the first arc portion is equivalent to a central angle of the fourth arc portion.   
     
     
         14 . The recording apparatus according to  claim 13 , wherein
 the second rotating member conveys the recording medium along the outer peripheral surface thereof such that the recording side of the recording medium bulges,   the fifth rotating member conveys the recording medium along an outer peripheral surface thereof such that the recording side of the recording medium bulges, and   as viewed along the rotation axis line direction, letting a second arc portion be an abutment portion between the recording medium and the second rotating member, and letting a fifth arc portion be an abutment portion between the recording medium and the fifth rotating member, a central angle of the second arc portion is equivalent to a central angle of the fifth arc portion.